Remove destruction-only TearDown() methods in Drive related test.

chrome/browser/chromeos/drive/drive_app_registry_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/drive/drive_app_registry.h"
 
 #include "base/files/file_path.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/drive/job_scheduler.h"
 #include "chrome/browser/drive/fake_drive_service.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 
 class DriveAppRegistryTest : public testing::Test {
  protected:
   virtual void SetUp() OVERRIDE {
     profile_.reset(new TestingProfile);
 
-    // The fake object will be manually deleted in TearDown().
     fake_drive_service_.reset(new FakeDriveService);
     fake_drive_service_->LoadAppListForDriveApi("drive/applist.json");
 
     scheduler_.reset(new JobScheduler(profile_.get(), fake_drive_service_.get(),
                                       base::MessageLoopProxy::current()));
 
     web_apps_registry_.reset(new DriveAppRegistry(scheduler_.get()));
     web_apps_registry_->Update();
     base::RunLoop().RunUntilIdle();
   }
@@ skipping 49 matching lines @@
   // Find by secondary MIME type.
   ScopedVector<DriveAppInfo> secondary_app;
   web_apps_registry_->GetAppsForFile(
       base::FilePath(), "text/html", &secondary_app);
   ASSERT_EQ(1U, secondary_app.size());
   VerifyApp(secondary_app, "abcdefghabcdefghabcdefghabcdefgh", "123456788192",
             "Drive app 1", "", false);
 }
 
 }  // namespace drive